CN108032707B

CN108032707B - Power-off control method for air conditioning system of pure electric vehicle

Info

Publication number: CN108032707B
Application number: CN201711471599.7A
Authority: CN
Inventors: 李伟鹏; 徐小兵; 于法祥; 施龙; 刘诚; 杨万里; 张念昱
Original assignee: Baic Changzhou Automobile Co ltd
Current assignee: Baic Heavy Truck Co Ltd
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2021-03-02
Anticipated expiration: 2037-12-29
Also published as: CN108032707A

Abstract

The invention provides a pure electric vehicle air conditioning system power-off control method, which comprises the following steps: disconnecting the A/C air conditioner switch, and simultaneously starting timing by the vehicle control unit; the vehicle control unit disconnects the compressor enabling signal; the vehicle control unit cuts off the enabling signal of the front condensing fan when the time reaches 30 s; and after the A/C air conditioner switch is turned on again, the vehicle control unit judges whether the timing time is less than 30s, and if the judgment result is less than 30s, the air conditioning system is in a state that the compressor works and the front condensing fan does not work. The invention solves the problem of abnormal sound of the compressor caused by internal high-low pressure difference of the compressor when the compressor is closed and immediately opened under the high-pressure state of the whole vehicle, and can quickly reduce the pressure difference of the high-low pressure air conditioning pipeline of the compressor, thereby ensuring the safety of the air conditioning system of the pure electric vehicle and the stability of the operation of the air conditioning system.

Description

Power-off control method for air conditioning system of pure electric vehicle

Technical Field

The invention belongs to the technical field of electric vehicle control, and particularly relates to a pure electric vehicle air conditioning system power-down control method.

Background

Almost all cars are equipped with vehicle air conditioner at present, and current light-duty electric motor car mostly adopts electric compressor control, nevertheless because prior art's is imperfect, leads to the electric compressor machine to be applied to and produce the abnormal sound condition on the whole car and appear, when whole car air conditioning system closed under high-pressure condition and opened immediately, thereby lead to the compressor abnormal sound condition because of there is high low pressure difference in the compressor inside.

Disclosure of Invention

In view of the above, the invention provides a power-off control method for an air conditioning system of a pure electric vehicle, so as to solve the technical problem that abnormal sound occurs when an electric compressor is turned off and immediately turned on in a high-pressure state in the existing pure electric vehicle.

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

The invention adopts the following technical scheme:

in some optional embodiments, a method for controlling power down of an air conditioning system of a pure electric vehicle is provided, which includes:

the A/C air conditioner switch is turned off, and the whole vehicle controller starts timing while the air conditioner control panel turns off the A/C air conditioner request signal; the vehicle control unit disconnects the compressor enabling signal; when the whole vehicle controller times to 30s, disconnecting the enabling signal of the front condensing fan; and after the A/C air conditioner switch is turned on again, the vehicle control unit judges whether the timing time is less than 30s, and if the judgment result is less than 30s, the air conditioning system is in a state that the compressor works and the front condensing fan does not work.

In some optional embodiments, the power-off control method of the pure electric vehicle air conditioning system further includes: and if the vehicle control unit judges whether the timing time is less than 30s or not, and the judgment result is that the timing time is greater than or equal to 30s, the air conditioning system enters the normal working state again.

In some optional embodiments, the power-off control method of the air conditioning system of the pure electric vehicle is characterized by further comprising: the vehicle controller judges whether the high voltage of the whole vehicle exists or not, and if the high voltage of the whole vehicle exists, the high voltage of an air conditioner is reserved;

and if the high pressure of the whole vehicle does not exist, stopping the compressor and the front condensing fan.

In some optional embodiments, the power-off control method of the pure electric vehicle air conditioning system further includes: and when the vehicle control unit is disconnected and the front condensing fan enables signals, the front condensing fan stops working.

In some optional embodiments, the power-off control method of the pure electric vehicle air conditioning system further includes: and when the vehicle control unit disconnects the compressor enabling signal, the compressor stops working.

The invention has the following beneficial effects: the invention solves the problem of abnormal sound of the compressor caused by internal high-low pressure difference of the compressor when the compressor is closed and immediately opened under the high-pressure state of the whole vehicle, and can quickly reduce the pressure difference of the high-low pressure air conditioning pipeline of the compressor, thereby ensuring the safety of the air conditioning system of the pure electric vehicle and the stability of the operation of the air conditioning system.

For the purposes of the foregoing and related ends, the one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed embodiments are intended to include all such aspects and their equivalents.

Drawings

FIG. 1 is a schematic flow chart of a power-off control method of a pure electric vehicle air conditioning system.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims.

As shown in fig. 1, in some illustrative embodiments, there is provided a method for controlling power down of an air conditioning system of a pure electric vehicle, comprising:

101: the air conditioning system normally operates, and the compressor and the front condensing fan are both in a normal working state.

102: and (4) turning off the A/C air conditioner switch, namely turning off the A/C air conditioner request signal by the air conditioner control panel, and starting timing by the vehicle control unit at the same time.

103: and the vehicle control unit disconnects the compressor enabling signal.

104: the compressor stops working, and the condensing fan is still in a working state at the moment.

105: and after 30s, namely when the whole vehicle controller counts the time to 30s, disconnecting the enabling signal of the front condensing fan.

106: the front condensing fan stops working.

107: and the vehicle controller judges whether the high voltage of the whole vehicle exists or not. The main relay in the whole vehicle high pressure, namely the high pressure box, is in a suction state, and the pre-charging relay is in a closed state.

108: if the high pressure of the whole vehicle exists, the high pressure of the air conditioner is kept, namely, the high-pressure relay of the compressor still keeps the attraction state, and only the enabling signal sent to the compressor by the vehicle controller is disconnected.

109: if the high pressure of the whole vehicle does not exist, the process directly enters the final state, and the compressor and the front condensing fan stop working.

110: the A/C air conditioner switch is turned on again.

111: and the vehicle control unit judges whether the timing time is less than 30 s.

If the judgment result is less than 30s, the air conditioning system is in a state that the compressor works and the front condensing fan does not work, namely the state of the air conditioning system in the step 104, and the time is counted to 30 s.

If the judgment result is greater than or equal to 30s, the air conditioning system enters the normal working state again, namely step 101.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

Claims

1. A power-off control method of an air conditioning system of a pure electric vehicle is characterized by comprising the following steps:

the A/C air conditioner switch is turned off, and the whole vehicle controller starts timing while the air conditioner control panel turns off the A/C air conditioner request signal;

the vehicle control unit disconnects the compressor enabling signal;

when the whole vehicle controller times to 30s, disconnecting the enabling signal of the front condensing fan;

when the A/C air conditioner switch is turned on again, the vehicle control unit judges whether the timing time is less than 30s, if the judgment result is less than 30s, the air conditioning system is in a state that the compressor works and the front condensing fan does not work; and if the vehicle control unit judges whether the timing time is less than 30s or not, and the judgment result is that the timing time is greater than or equal to 30s, the air conditioning system enters the normal working state again.

2. The pure electric vehicle air conditioning system power-off control method according to claim 1, further comprising:

the vehicle controller judges whether the high voltage of the whole vehicle exists or not, and if the high voltage of the whole vehicle exists, the high voltage of an air conditioner is reserved;

3. The pure electric vehicle air conditioning system power-off control method according to claim 2, further comprising: and when the vehicle control unit is disconnected and the front condensing fan enables signals, the front condensing fan stops working.

4. The pure electric vehicle air conditioning system power-off control method according to claim 3, further comprising: and when the vehicle control unit disconnects the compressor enabling signal, the compressor stops working.